Re: 10 best pieces of evidence for public debate (from Scholars forum) Reference to article: www.911blimp.net/prf_Free...sics.shtml
I have a colleague who has had a lot of trouble with the "free fall" speed of the collapses of WTC's 1, 2, and 7. I mean he glosses over this issue and I have never pressed it, per se. Mainly because while I thought about it a bit a year+ ago. Now, every time somebody references it (like Griffin, etc) I barely note it. But then I read the article noted above. And a person like me... while I am a neuroscientist, I don't usually think in terms of physics... And I am sure he doesn't really think through those implications either. Because he does not really want to believe for psychological reasons. But when you do think through the physics.....

Here is the reason why. Think of it this way. Every single floor of any of the WTC tower would offer what kind of resistance to a falling body? You know, the upper floor(s) falling down? Remember that each floor is a spider web of trusses, beams, the central core connecting all together at -each- level, each floor. Do you suppose each floor might add a second's worth of resistance over that encountered if there were simply -air- there instead of all those bolts, trusses, beams etc.? Or might it be 2 seconds? 3? or 4? For the sake of argument let me say, absurdly, that all of that steel and structure would add only .5 second over the resistance of air alone. Air just by itself. On average. Remember, the upper floors would have provided more resistance as the mass and its velocity was just getting started, I suppose. How many seconds would it take for the entire building to collapse into rubble? Well, how many floors were there in WTC 1?

110 floors in WTC 1. So at .5 second per floor that is what, 55 seconds? How long did it take for the entire thing to come down?

10 + or - a few milliseconds. Just 10. Free fall speed. How can that be? There can be but one conclusion. It thus appears incontrovertibly true that *all* the resistance of the lowers floor had to be removed (removing all structural resistance - but not air resistance of course) as the upper structure fell. And the resistance not only * removed* but removed mostly equally across all of the surface at each level (otherwise the building might have toppled over sideways) during the collapse.

The only falling buildings that have * ever * fit that profile of collapse are buildings undergoing controlled demolition.

And as an aside, I wonder that part of the reason some folks get into thinking of energy weapons and the like being used is that the falls of WTC 1 and 2 almost seems too damn fast for physics to explain. Along with the pulverizing, *dematerializing* of the lower structures, glass and stuff as the building fell. That stuff is way past my measely knowledge of physics but the "controlled demolition" - however accomplished, appears to be solid scientific fact.

Thus, at least this part of the government's conspiracy theory fails. Miserably.

Puffs of smoke on the east side of the North Tower, at the time of the impact, can be seen at the msnbc.com site:

http://video.msn.com/v/us/msnbc.htm?g=b65b02ee-76ff-4bc3-be24-c8ba130bab...